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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4eb232843f0b017db459d6bd38df74f0b91e19810ae2d0dc5ea123cbc79472e' 
  AND token = 'rT73DVOnaqnmz7SoiymQwGAdfcfaGBTfc0S/GMGlDtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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