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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af1beff25b92178d46fe541f2a17398326f70df70444953629645a2bb9afac9' 
  AND token = 'NhM2gN0nlTNU8FNFK0q1MxwmDX25TJ4g8ODdW2DIYG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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