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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c84a56b2f5d5c21380100ef29779479cced676e29e3b43965dbced2423bd29' 
  AND token = '0bx+9bSuryyhDDoUlUpr/+Z+f5oR+gAgwupKY+Cy50c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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