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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bdf167e5ca79d702b11e53c460a38d41da1b374609b696b03cc2539c216856' 
  AND token = 'NxYRSpGYVoE7SPZyln5EzNov2y+Nt6EOANZHCfGKI58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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