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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3dbb01cc090574a1db564aca1b8773656cef1558aef7f5a82f8204678fc04e' 
  AND token = 'c3uu2bHJiolRs8GisfAzovPSXUToIde4cpDW9Opq9gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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