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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556dabf4963f6af90cc0f242220c5f9e490ece3810bc54c45b38dc4a061103f7' 
  AND token = 'Pa6FMx1zt89nG2r67U+P+9snNW8mEE+OPcS9X0v3uKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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