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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ade67a266c287162e6eaf4b271f221576e25077218affa8811559c21d749dd9' 
  AND token = '7C2vWgW1dzYaTYjZVXUISqJsCdUFyjA2npQ0hcANVsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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