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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277f70753c58e8aa6ebdf98b32e32a042d45619e240fb7f2e1bef808cb0facb3' 
  AND token = 'hQlfapX4nzMCvV7AoJXAvaHeGCG05ac0g4Zj5U9N4HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}