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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f371811858119a53088a09e079c3aad0821b69ed628dccecd08eef78d091c2c' 
  AND token = 'RZLn90AIUOm3Msn0lO22l6XCB6nxaqleTzx4Mx/7v0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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