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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc9f7f3e0b398c1ea428cd7f32e197749b4e80d1b107204ce40a0488be89cc8' 
  AND token = 'OwMu6oHvYWjne4Png35H6io9hIh5xts9VzgnO4+X86k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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