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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91ef6ae14010dd86b89680b2fce973c5c9952877db71951707e56416e3bc087' 
  AND token = 'ZKMTm1i3eAEhL6M5BLeA0IeLhVMf+2xWeN8QPRq234E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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