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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3eccb505f91118be5b3abaac642546df2b071a05198e7f8f4d2ec075d2ba4d4' 
  AND token = 'A4yx1BP3SB4lCEqFRPGY6nQF1dkBg505k7RvrC7I4Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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