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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39217b98d2d3a7c6cb8a0b3f1004796ca91ca57977e80f53a518640c0e08b98' 
  AND token = '5UObNfhSK1TV/Vwcwwwe8r67Vx/Sxn/A/ZUUJVXgnCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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